package com.sky.service.impl;

import com.aliyun.oss.common.utils.StringUtils;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;
   /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //用于存放每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            //计算日期，计算指定日期的后一天
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额，指已完成的订单状态合计
            LocalDateTime beginTime  = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime  = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where order_time >= beginTime and order_time < endTime and status =5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        // 将日期列表转换为字符串格式
        List<String> dateStringList = dateList.stream()
                .map(LocalDate::toString)
                .collect(Collectors.toList());

        // 将营业额列表转换为字符串格式
        List<String> turnoverStringList = turnoverList.stream()
                .map(String::valueOf)
                .collect(Collectors.toList());

        // 封装返回结果
        return TurnoverReportVO.builder()
                .dateList(String.join(",", dateStringList))
                .turnoverList(String.join(",", turnoverStringList))
                .build();

    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放begin和end之间对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin  = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的新增用户数量 select count(id) from user where create_time >= beginTime and create_time < endTime
        List<Integer> newUserList = new ArrayList<>();
        //存放每天总的用户数量 select count(id) from user where create_time < endTime
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end",endTime);

            //总用户数量
            Integer totalUser  = userMapper.countByMap(map);
            //新增用户数量
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        // 将日期列表转换为字符串格式
        List<String> dateStringList = dateList.stream()
                .map(LocalDate::toString)
                .collect(Collectors.toList());

        List<String> totalUserListString = totalUserList.stream()
                .map(String::valueOf)
                .collect(Collectors.toList());
        List<String> newUserListString = newUserList.stream()
                .map(String::valueOf)
                .collect(Collectors.toList());
        //封装结果数据
          return UserReportVO
                  .builder()
                  .dateList(StringUtils.join(",",dateStringList))
                  .totalUserList(StringUtils.join(",",totalUserListString))
                  .newUserList(StringUtils.join(",",newUserListString))
                  .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
           begin  =  begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        //便利dateList集合查询有效订单数订单总数
        for (LocalDate date : dateList) {
            //查询每天订单总数 select count(id) from orders where order_time >= beginTime and order_time < endTime
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天有效订单数 select count(id) from orders where order_time >= beginTime and order_time < endTime and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();


        // 计算时间区间内的有效订单数
         Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

         //计算订单完成率
        Double orderCompletionRate = 0.0;
         if(totalOrderCount != 0){
             orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
         }

        // 将日期列表转换为字符串格式
        List<String> dateStringList = dateList.stream()
                .map(LocalDate::toString)
                .collect(Collectors.toList());
         List<String> orderCountListString = orderCountList.stream()
                 .map(String::valueOf)
                 .collect(Collectors.toList());
         List<String> validOrderCountListString = validOrderCountList.stream()
                 .map(String::valueOf)
                 .collect(Collectors.toList());

        return OrderReportVO.builder()
                .dateList(StringUtils.join(",",dateStringList))
                .orderCountList(StringUtils.join(",",orderCountListString))
                .validOrderCountList(StringUtils.join(",",validOrderCountListString))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }
    /**
     * 查询指定时间区间内订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }
    /**
     * 销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        // 直接使用 String.join 拼接商品名称和数量
        String nameList = String.join(",", salesTop10.stream()
                .map(GoodsSalesDTO::getName)
                .collect(Collectors.toList()));

        String numberList = String.join(",", salesTop10.stream()
                .map(GoodsSalesDTO::getNumber)
                .map(String::valueOf)
                .collect(Collectors.toList()));

        // 封装返回数据
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();

}
}
